The theme for the Christmas show at the U.S. Botanic Garden is holiday dreams. The show is open daily through Jan. 8, including Christmas and New Year's Day, from 9 a.m. to 5 p.m. The display includes more than 1,000 poinsettias, along with other holiday plants, two large topiary bears and toys. The East Gallery features a model train. Free. The garden is at 100 Maryland Ave. S.W. Call (202) 225-7099.
"Farm Day During the Winter" exposes children ages 6 to 12 to farm life during winter months at the Old Maryland Farm in Upper Marlboro Tuesday from 7 a.m. to 5 p.m. The cost is $15 and includes all activities, snacks and lunch cooked over an open fire. Reservations are required. The farm is at 301 Watkins Park Drive in Watkins Regional Park. Call (301) 249-7077.